Abstract
We present collision strengths and rate coefficients for electron-impact excitation of He-like ions (S14+, Ar16+, Ca18+) using the Dirac Atomic R-matrix Code, which has been developed by Norrington and Grant [J. Phys. B: At. Mol. Opt. Phys. 20 (1987) 4869]. The lowest 45 target levels are included in the calculation to obtain the rate coefficients for the 1s21S0–1snl1,3LJ (n=2,3,4; l=0,1,2,3). Results are compared with those available in previous calculations.
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